Questions tagged [blockchain]

The journal of all confirmed Bitcoin transactions. The blockchain consists of a linked sequence of blocks and each block contains a list of transactions.—Please use [blockchain.info] for the eponymous UK-based company.

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what is expectedFees and expectedWeight in a block and why its changing frequently?

what is expectedFees and expectedWeight in a block and why its changing frequently ? https://mempool.space/api/v1/block/00000000000000000001c680ee86b8eaa43c94ac9012f4d2dcbfa9f45beadf06 when i last ...
N.dhanush raj's user avatar
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Blockchain's iPhone app saying I’m sending over limit [duplicate]

I have the Blockchain app on my iPhone which I've been using regularly for years but which in fact I haven't used for the last 2 months. It currently has around $81 worth of BTC in my private wallet. ...
Timi's user avatar
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4 votes
2 answers
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Can an unconfirmed transaction be confirmed several years later?

Suppose that I make a transaction, but due to a low fee it is not confirmed even after several weeks. The transaction is then removed from the mempool of most nodes (and also my wallet disregards the ...
n00p's user avatar
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I'm trying to determine if https://web.optiontradingso.xyz/h5/#/ is legit or not. Does anyone know? [duplicate]

Does anyone know if https://web.optiontradingso.xyz/h5/ is legit or is it a scam?
Mds51's user avatar
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bitcoin block chain - database - how to request / how to get status of an object? [NOOB]

I wonder about the bitcoin and blockchain. I think I have understand the purpose of a blockchain. (security/decentralisation) Ok we save transaction on blocks validate thanks to the proof of work. But ...
Marcel kobain's user avatar
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bitcoin transaction stuck on bitcoin.com [duplicate]

transaction id - https://mempool.space/tx/af483ce44a4605a9f13faf66d37e42f574377f7a7723ada51c01f4b98aebdcca I did transaction on bitcoin.com but 28hours ago transaction pending and money deducted I am ...
andrew's user avatar
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2 votes
2 answers
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How can an external party be sure that node's response is valid?

Assume that 51% of nodes are honest and 49% malicious. Fur sure, longest chain would make the chains consistent/same all over the world as 51% can outweigh the 49%, but my question is slightly ...
Giorgi Lagidze's user avatar
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1 answer
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Can I read blockchain's information from Electrum's python console?

I wanted to use Electrum's python console, but the documentation just gives a few examples. Is there a more complete documentation about python commands inside Electrum ? Main tasks I currently want ...
ewen-goisot's user avatar
3 votes
1 answer
84 views

How are Bitkey's spending limits enforced?

Block's new Bitkey is a 2-of-3 multi signature wallet (https://bitkey.world/en-US) I've been reading their white paper, which is a good summary of their intentions, but doesn't really go into ...
atonaltensor's user avatar
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Question about nextblockhash in bitcoin block struct

In the book "Mastering Bitcoin" (3rd edition), on page 46, there is an element nextblockhash in the block struct after issuing a getblock command, anyone can explain it and how to use it. ...
fa william's user avatar
2 votes
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Moving the entire directory to new location for Bitcoin Core CLI

I use Bitcoin CLI and not the QT one, when syncing i used a external SSD to store blocksdata in SSD, obviously noob me didnt know of datadir function Now my Chainstate, txindex are in roaming folder ...
123demigod's user avatar
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List of Bitcoin exchanges available in 2009

hope you can help. I am helping a friend to find their Bitcoin wallet. The wallet is believed to have been created in 2009 and the coins were transferred to a Bitcoin exchange. My question is what ...
Luka's user avatar
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bitcoin block time analysis with conjuction to propagation

For both scenarios that I will describe below, assume the 2 things. that network propagation for blocks always 6 seconds. that we start looking at my analysis from time = t0 and at that t0, every ...
Giorgi Lagidze's user avatar
3 votes
2 answers
487 views

How do I find out who sent me Bitcoin?

I'm working on creating a service where it will accept Bitcoins from a certain address and be able to manage the Bitcoin for that user. I'm using Coinbase APIs and I can't find a simple way to find ...
Riz's user avatar
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What happened to this Bitcoin transaction? Block fee lost?

I'm writing a bitcoin blockchain indexer. I've indexed every block hash and now I'm working on indexing each transaction in each block. I've been finding some weird stuff here and there and I don't ...
user2880722's user avatar
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What happens if all transactions are being used?

I know that there are an upper limit to the number of hashes that can be mined. But I do not know why is this a case? I guess it is due to the enormous amount of computation necessary to find hashes. ...
Péter Szilvási's user avatar
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bad data structure cause "Signature must be zero for failed CHECK(MULTI)SIG operation"

i could not fix the problem using available answer for this error on BSE. this is my previous transaction. i test alot of different data structure which was said to be the correct one but i got ...
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I Get "Non-canonical DER signature" Error

it was asked few times in BSE and they were pointing the problem to the sighash which was not appended to the transaction but i did it and still have problem. i had a problem with amount of fee and ...
user avatar
1 vote
1 answer
93 views

What are ALL the consensus rules?

I asked this question before, and it was quickly locked and pointed to a thread about mempool policy... yet my question remains unanswered. Let it be known, I don't want to know what policy is [or is ...
DoctorBuzz1's user avatar
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How are NFTs stored in the bitcoin blockchain? [duplicate]

I'm new to bitcoin and am looking into how NFTs are stored into the blockchain. I saw somewhere that Taproot Script-Path Spend Scripts is where NFT data is stored but I'm not sure how. Can someone ...
mark's user avatar
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Which part of bitcoin is sitting or moving

With Bitcoin ETFs on the horizon I expect that I am not the only person hoping to gain deeper understanding of the way bitcoin moves. I wonder if there is any insight in which part of the bitcoins ...
Dennis Jaheruddin's user avatar
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How to create own crypto currency like bitcoin? [closed]

I would like to create a crypto currency like bit coin. So is there any step by step guide or procedure that will help me to create ones? It would be appreciated if you provide me that.
Spammer McSpamington's user avatar
1 vote
2 answers
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Is it possible/feasible for nodes to redact information (for example inappropriate images) in their blockchain and remain part of the network?

With the freedom to run nodes being critical to bitcoin's success, I'm concerned that if someone successfully writes highly inappropriate or abhorrent information/images as a valid transaction then ...
evo_race's user avatar
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Hello, I want to know if they use blockchain and if I have to pay any transaction fees

yesterday I made a bitcoin transaction and they did not receive the full money and I was checking what it could have been and I think it was the blockchain and I have several doubts about that, can ...
user147414's user avatar
1 vote
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30 views

At what point in time is this "sendcmpct" message sent

In Bitcoin Core, when setting a node to either high-bandwidth mode or low-bandwidth mode, a "sendcmpct" message is sent. At what point in time is this "sendcmpct" message sent? Is ...
masuda's user avatar
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In Bitcoin Core, how do nodes transmit blocks, either in parallel or in series? [duplicate]

In Bitcoin Core, do nodes transmit blocks sequentially to adjacent nodes, or is it a parallel transmission where blocks are sent to multiple nodes simultaneously? Additionally, could you provide ...
masuda's user avatar
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4 votes
1 answer
372 views

In Bitcoin Core, are blocks sent in parallel or in series?

Are blocks sent in parallel or in series? I would also like to know about the implementation part of Bitcoin Core.
masuda's user avatar
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Create account and transfer usdt into the wallet adress. Used block chain to search address. Why was the adress used before i created my account?

There is an app i was led to called kzzy. You can fund your account with btc, eth, and usdt. All crypto converts to usdt once transferred to account. I am given two wallet addresses to send crypto to. ...
William J Kershaw's user avatar
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Crypto falling into the crypto universe due to blockchain break [duplicate]

A trading entity processed a withdrawal and sent the supposed USDT to my wallet address. However the USDT I was expecting never arrive in my wallet. Upon checking, the trading platform support claimed ...
Francis Uy's user avatar
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How to find the most active bitcoin addresses?

Is there a way (preferably a webpage) where I can find a list of the most active bitcoin addresses, sorted by number of transactions, possibly also filtered by a timeframe? I am not interested in the ...
blueFast's user avatar
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A wrong wallet situation

On 9th of this month I have my dad send me some bitcoin and I gave him my wallet for the payment.. after a while he told me he sent it I didn’t see it and I taught it was network and I would get it ...
Josh's user avatar
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1 vote
1 answer
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What is fee sniping?

What is a fee sniping attack? In several places I came across a mention of this type of attack, however, it is not clear to me what it represents. They also say that today it is not so common and ...
LeaBit's user avatar
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7 votes
2 answers
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What is the Block 1,983,702 Problem?

The issue, transition to requiring block height in block coinbases, was discussed back in 2012, however I just stumbled upon it, and would like to understand more about its significance.
BitcoinFanatic's user avatar
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Reflecting Fee? [duplicate]

I'm currently dealing with a case where I am asked to pay a Bitcoin reflecting fee in order to receive my withdrawl amount to my cashapp/bitcoin wallet. It is not currently showing anything pending on ...
Christi's user avatar
0 votes
1 answer
629 views

Is it real BTC or fake [duplicate]

All, I received some BTC to my coinbase wallet after someone asked me to setup custom network using the below setting. I received the BTC but I couldn't transfer to any other wallet and the says ...
san's user avatar
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17 views

Blockchain confirmation [duplicate]

I'm not at all sufficient with this but what does it mean when they say I need one blockchain confirmation? I'm new to this and need it in laymans terms.
Red's user avatar
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1 vote
1 answer
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missing BTC - on chain but not in my personnel wallet

Missing Bitcoins BTC On the 25th Oct 2023 I bought some BTC from the company I always use Bitttylicious the wallet I sent it to was 1kgXpdiYKZq5bLEVUhABiHbu4nLsg7bCT I spoke to bittylicious and did ...
Pàul lucas's user avatar
1 vote
1 answer
308 views

Why does everyone talk about the blockchain being a record of transactions if it’s just a hash?

I’m trying to get to know how cryptocurrency works and everyone treats the blockchain like an active record of every transaction, like if someone wanted to reuse the same bitcoin with the same code ...
Johnafoon's user avatar
7 votes
3 answers
2k views

Why is there a block size limit and why not increasing it?

Storage costs are now ridiculously smaller than they were when the limit was introduced more than 10 years ago. I am concerned keeping this arbitrary limit set by Satoshi could be holding us back. Why ...
N. Matic's user avatar
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Can layer 2 or higher on Bitcoin handle billions of transactions and records to enable a form of decentralised democracy? [duplicate]

Essentially I'm asking if layer 2 or higher can handle billions of transactions and records as I'd like to develop / encourage the development of an app that can essentally hold all voter records (for ...
Wesley Kellingray's user avatar
0 votes
0 answers
53 views

Sent Bitcoin not received [duplicate]

I sent my boyfriend Bitcoin, he has not received it yet. Is there something that I did wrong? it shows that the transaction started, but there's no green light to state that he's received it.
Sukari Campbell's user avatar
2 votes
3 answers
757 views

Why is the blockchain important?

The title says it all. What’s it important for? Is it just important for documenting all transactions and so it’s basically just a database? I know how blocks are made, please remain relevant.
Johnafoon's user avatar
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29 views

NodeJS code to deobfuscate chainstate data

I am currently working on a Blockchain trading platform for a company and I want to have all the unspent output saved to a local database by reading the contents of chainstate folder but I couldn't ...
Topman's user avatar
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single mnemonic to create private key with different networks

I have both 12 and 24 words, but i can't remember which coin it has. so shall i try all wallets to find out which has a coin or is there anything i can do practical? with a 24 words can i create a ...
Septimus's user avatar
1 vote
1 answer
90 views

Why do I need to download the entire blockchain for a wallet when I can make one one with open source java like bitaddress.org

Like title said. And when i will have to use the btc I can login the wallet with the private key on a hot wallet.
Papi's user avatar
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0 answers
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Unconfirmed bitcoins deposit from online casion. they paid a fee of 1.82 on a 4k withdrawal.. what do I do? [duplicate]

I made a bitcoin withdrawal from a online casino of $4000. They sent me the payment but it won't confirm. I see they payed a fee of $1.82 so I'm sure thats why it hasnt confirmed yet but Its been a ...
That one dude's user avatar
0 votes
0 answers
40 views

2 bitcoin transactions are stuck on mempool, one is CPFP

I use BlueWallet and I have two pending bitcoin transaction One outgoing One incoming The outgoing transaction is a CPFP Both the ancestors and descendants transaction are stuck for hours now How can ...
Mike's user avatar
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1 vote
1 answer
304 views

Blockchain pruned node still downloading old blocks

We are working on a Bitcoin project for which we need to have the bitcoin node. The point is that we do not need to have the entire bitcoin node downloaded but only from the moment we start the ...
SamYan's user avatar
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1 vote
1 answer
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Do Bitcoin actually exist on the bitcoin network?

Where can I find the bitcoin on the blockchain? Do they exist? Are they physically being moved when transferred? How can I custody them in cold storage if they are on a public blockchain?
BitcoinFanatic's user avatar
1 vote
1 answer
48 views

Blockchain API not sending subscribed info

I'm having trouble receiving WebSocket messages for address-related events. Here is the code that I'm using (trackAddress gets called externally and I'm sure it sends the right thing). I also tried ...
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